Continuous automatic gravity-discharge reheating-furnace



A. W. HORN CONTINUQUS AUTOMATIC GRAVITYDISCHARGE REHEATING FURNACE.

, APPLICATION FILED APR. 21, I920. msmw Patented May 81, 1921.

3 SHEE'iSSHEET 1.

A. W. HORN. CONTINUOUS AUTOMATIC GRAVITY DISCHARGE REHEATING FURNACE.

Patented May 31, 192R.

3 SHEEISSHEET 2.

A. W. HORN.

CONTINUOUS AUTOMATIC GRAVITY DISCHARGEREHEATTNG'FURNAUE. APPLICATION FILED APR. 21, 1920. 1,380,1020' Patented MayBl, 192 1.

T 0- all whom it may concern ALBERT WILLIAIE HORN, OF CHICAGO, ILLINOIS:

'conrnwons AUTOMATIC GRAVITY-DISCHARGE REHE'ATING-FURNACE.

Specification of Letters Patent. if Pate ted May 31, 192 1.

Application filed April 21,1920. Serial No. 375,5 37.

Be it known that I, ALBERT W. HORN, a

. citizen of the United States, residin at Chicago, in the county of Cook and. tate of Illinois, have invented certain newand useful Improvements in Continuous Automatic Gravity-Discharge Reheating-Furnaces, of which the'following is a description. My'invention belongs to that general class of apparatus designed to-reheat billets of metal during the process of manufacture.

It has for its object the production of apparatus simple and effective in operation, whereby the billets may be more equably heated throughout all their parts during the passage through the reheating furnace.

To this end it consists in the novel con struction, arrangement and combination of parts hereinshown and described and more particularly pointed out in the claims.

In the drawings, wherein like reference.

characters indicate like or corresponding parts,

Figure 1 is'a central'vertical longitudinal section through a. reheating furnace illustrating my invention charged. The abutments 4 are spaced from.

Fig. 2 is a horizontal section substantially on line 2-2 of Fig. 1

Fig. 3 is a transverse section substantially on line .3-3 of Fig. 2; I

Figs. 4 and 5 are detailed views illustrating one form of heating'members; and

Fig. '6 is a vertical longitudinal section partly broken away, illustrating more fully my improved furnace and-the sub-chamber cooperating therewith.

In the drawings. 1 indicates the top of my improved furnace and 2 the bottom of the reheating chamber. The skids?) are arranged substantially parallel to one another, and are composed of pipes which are kept sufiicientlycooled by water forced therethrough. These pipes are supported upon suitable abutments 4: arranged at 1ntervals, and are preferably inclined upward from the point where the billets enter the furnace to the point where they are'disone another, and between them I arrange a series of preferably communicating pits 5, which in the preferred construction are provided with outer closures 6. 7 indicates the billets passing through the furnace, propelled by suitable means exterior to the furnace, the billets being pushed-forward 1n a Column substantially as indicated.

what is termed a black affects the finished product unless efi'ectu-' The skids 3 are continued up toward the discharge end of the furnace, and are there ly' bent lnwardly as at 8, thencev prefera downwardly as at 9, thence horizontally as at 10, thence upwardly .asat' 11, and thence incllned downward as at 12, so that the billets will bedischa'rged by gravity, pass mg beneath a pivoted closure13. It will be seen that the discharging inclined skids,

as'at 12 12, are not in alinement with the main portion of the skids 3 -3, but are oilset therefrom. Arranged in a forward chamber are suitable heating members '14,

arranged in alinement with the parts 3-3 of the skids. ,The wall 15 is sectional, as

shown, providing two end sections and a I merly in contact with the skids 3-3 are over the pits 16.16 and the heat from the heating members 14 is directed thereon.

It is thus clear that that portion of the billets coming in contact with the cooled sklds 3- -3 is not permanently heated to the same extent as the other portions, causing spot, and which ally. removed. This is removed, by my improved device, as the temperature at the par ticular spots mentioned is brought up to the same temperature as the-balance of the billets.

17 indicates one or more of the heating members for the furnace, the same being positioned above the billets as indicated.

In this form of furnace, as indicated, a greater portion of the heatnormallytends to seek the upper part ofthe furnace and the upper part of the billets, and it is desirable that s'uitable means be provided for increasing the temperature below the lower i surface of the billets.

This, I prefer to accomplish by a suitable arrangement of heating members positioned below the lower surface of the billets asindicated. I

18 indicates preferably a series of air pipes within which are positioned suitable conducting plpes 19 for the heating medium. The pipes 12 .are controlled by valves 20 positioned 'outside the furnace, so that the The alr I are projected through the walls of the furnace, the first one at the left cooperating with the burners 1 1. The next to the right may, if preferred, terminate in simple heating members at each side of the walls, d1- recting the flame into the pit 5. Arranged at intervals, the pipe 18 may be extended.

' inclined extension 12, escaping beneath the substantially through from side to'side of the furnace, as indicated at 21, and be provided with a plurality o fburners or heating members, as at'22, preferably directing the heatupward at an inclination so thatit w1ll contact with the lower surface of the billets, as indicated.

Any preferred or well known means may,

be employed for securing and controlling the proper regulation of the alt. Tn the preferred use, the air is heated, in the usual manner prior to being delivered into thefurnace. I

As illustrated in Fig. 6, the draft above the billets is indicated as .toward the right, and is drawn downward through the flue 28, and thence through the plurality of openings 2 1 in the rear wall into the heating chamber 25, thence through the plura'lityof openings 26 in the opposite end wall 27, thence through a flue 28, and finally to a stack 29, where it is discharged into the atmosphere. The incoming air is introduced at a suitable port as at 30 and thence through a tortuous passage 31, passing about 'suitable'bafile plates 32, and is finally discharged into a suitable flue-33, which conducts the air through the various leads of pipe 3 1, supplying the air pipes 18, and the burners 19. I

Tf desired, the passing current of heated air below the billets may be conducted by a separate flue 35 discharging into the stack 29. Any\ preferred means may be employed for controlling the several fiues. The flue 85 may be providedjwith a movable damper 36 and the fine 28 with a similar damper 37. The air delivered to the intake flue 30' is preferably under pressure, any preferred means, as at 38, being employed for this purpose. I

The mode of operation is apparent. The

billets are delivered as indicated at the right.

hand end of the furnace in a continuous columnby feeding means arranged outside the furnace. They are pushed up the skids 3 and the intervening wall 15, and are thus delivered by gravity alone by means of the automatic door 18.

. The incoming air necessary for proper.

combustion is forced through the flue'30 into a tortuous passage 31 arranged in the chamber 25, the air being heated by reason i of the high temperature maintained in the The heat delivered above the billets, as at- 17, is maintained in any preferred manner,

and passing rearward, serves to maintain the top of the furnace at a high temperature. That portion of the lower surfaces of the 'hillets resting upon the skids 8 and those cooled by contact therewith, is reheated as they pass over the pits 16 and the heating members 14:.

The entire. apparatus is very effective in operation and the billets may be delivered preheated to substantially the. same temperature throughout, and thus avoiding the defectscaused by the black spots before referred to.

Having thus described my invention, it is obvious that various immaterial modifications may be made in the same without departing from the spirit of my invention; hence I .do not wish to be understood as limiting myselfto the exact form,-eonstruction, arrangement and comblnatlon of parts herein shown and described, or uses mentloned.

What I claim as new and desire to secure by Letters Patent is:

1. Tn an apparatus of the kind described, a reheating furnace provided with cooled skid members for the billets, said skids at a suitable point being offset and continued out of alinementwith the preceding part thereof, in combination with means for ad- 3 mitting a. heating medium above the advancing billets, and independent means for directing a heating medium upon the advancing billets upon'the lower surface'thereof at the points where said billets were previously in Contact with-the skid members.

2. In an apparatus of the kind described, a reheating furnace'provided with cooled skid members for the billets, said skids at a suitable point being. offset and continued out of alinementwith the preceding part thereof, in combination with means for directing a heatingmedium inthe space above the advancing billets, lndependent means for directing a heating medium in the space beneath the advancing billets and means for directing a heating medium upon the lower surface of the advancing billets atthe points where said billets were, previously in contact with the skid members.

3. In an apparatus of the kind described, a reheating furnace provided with cooled skidmembers for the billets, said skids at a su table point being ofiset and continued dium upon the lower-surface of the advancing'billets at the points where said billets were previously in contact with the skid members. v

' 4. In an apparatus of the kind described, a reheating furnace provided with cooled skid members for the billets said skids at a suitable point being offset and continued out of alinement with the preceding part thereof, in combination with means fordirecting a heating medium, both above and below the advancing billets, means for regulating said heating medium, and means independent of said first named means for di recting a heating medium upon the lower surface of the advancing billets at the points where said billets were previously incontact with the skid members.

5. In a device of the kind described, a reheating chamber provided with longitudinally extending cooled skid members, said skid members at a point near the discharge end being extended inward toward each other and out of alinement with the preceding portion of said members, and thence outward and being downwardly inclined to discharge the billets, in combination with independent heating members arranged to direct the heating mediums substantially in line with the parallel skid members and upon the lower surface of the billets at the points where said billets were previously'in contact with the skid members.

6. A device of the kind described, comprising a reheating ,chamber provided with longitudinally extending cooled skid members, ofl'set during their course to uncover the contact points of the billets therewith, means for admitting heat above said billets and independent means for directing a heat ing charge upon said uncovered parts.

r. A device of the kind described, com-' prising a reheating furnace provided with longitudinally extending cooled skid members for the advancing. billets, means for admitting a heating medium above the billots, and independent means for admitting the heating medium at a plurality of points beneath the advancing billets.

S. A device of the kind described, com-- prising a reheating chamber provided with longitudinally extending parallel cooled skid members for the advancing billets, means for additionally heating that portion of the billets which had previously rested upon the skids, means for admitting a heating medium above the billets, means for independently admitting a heating medium below' the billets, and means for regulating said heating medium.

9. device of the kind described, comprising areheating furnace provided with longitudinally extending parallel cooled skid members for the advancing billets, means for admitting a heating medium above the billets, in combination with means for admittin a heating medium below the billets in a orizontal direction, and additional means for admitting a heating medium below the'billets in an upwardly inclined di-' rection. 10. In an a paratus of the kind described, a reheating urnace provided with longitudinally extending parallel cooled skid members, means for admitting a heating medium above the skid members, and means for ad mitting a heating medium below the skid members, in combination with means for causing a circulation of the said heating medium in the furnace, and independent means for controlling the circulation of the heating medium above and below the billets.

11. A device of the kind described, comprising a reheating furnace provided with cooled skid members for the advancing billets, means for admitting a heating medium above the billets, and means independent of said first named means for admitting a heating medium beneath the advancing billets.

12. A device ofthe kind described, comprising a reheating furnace provided with.

cooled skid members for the advancing bil lets, means for admitting a heating medium above the billets, and means for admitting *a heating medium beneath the advancing billets, said last named means being adapted to be regulated independently of said first namedmeans.

I11 testimony whereof, I have hereunto signed my name in the presence of two subscribing witnes'ses.

ALBERT WILLIAM HORN.

- Witnesses: 3

\JOHN W. HILL,

' BERTHA HARTMANN. 

